Leases Lessor Lease Revenues (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2020		Mar. 31, 2020	Jun. 30, 2019	[1],[2]	Jun. 30, 2020	Jun. 30, 2019
Lessor, Lease, Description [Line Items]
Sales-type Lease, Selling Profit (Loss)			$ 209
MPC
Lessor, Lease, Description [Line Items]
Operating Lease, Lease Income	$ 195	[1]		$ 246		$ 381	$ 525
Sales-type Lease, Interest Income	38					76
Sales-type Lease, Variable Lease Income	0					0
Third Party [Member]
Lessor, Lease, Description [Line Items]
Operating Lease, Lease Income	66	[1]		$ 68		129	$ 133
Sales-type Lease, Selling Profit (Loss)	0					0
Sales-type Lease, Interest Income	0					0
Sales-type Lease, Variable Lease Income	0					0
MPC
Lessor, Lease, Description [Line Items]
Sales-type Lease, Selling Profit (Loss)	$ 0					$ 0

[1] These amounts are presented net of executory costs.

[2] Financial information for the three and six months ended June 30, 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.